Question

Substances which not produces flames reason

Answer 1

Answer:

Along with heat, some produce flame or glow. The substances which vaporize during burning give flames. For example combustion of kerosene oil produces flame. On the other hand certain substances like coal do not vaporize and hence doesn't produce a flame.

Explanation:

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Answer 2

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flame is produced as a result of combustion. Combustion is the chemical process of giving out flame. Incombustible substances only vaporize in excess heat without giving a flame. Whereas, combustible substances produce flame and glow . In the process of combustion , a substance reacts with oxygen to produce flame and heat.